Book Image

Linux for Networking Professionals

By : Rob VandenBrink
1 (1)
Book Image

Linux for Networking Professionals

1 (1)
By: Rob VandenBrink

Overview of this book

As Linux continues to gain prominence, there has been a rise in network services being deployed on Linux for cost and flexibility reasons. If you are a networking professional or an infrastructure engineer involved with networks, extensive knowledge of Linux networking is a must. This book will guide you in building a strong foundation of Linux networking concepts. The book begins by covering various major distributions, how to pick the right distro, and basic Linux network configurations. You'll then move on to Linux network diagnostics, setting up a Linux firewall, and using Linux as a host for network services. You'll discover a wide range of network services, why they're important, and how to configure them in an enterprise environment. Finally, as you work with the example builds in this Linux book, you'll learn to configure various services to defend against common attacks. As you advance to the final chapters, you’ll be well on your way towards building the underpinnings for an all-Linux datacenter. By the end of this book, you'll be able to not only configure common Linux network services confidently, but also use tried-and-tested methodologies for future Linux installations.
Table of Contents (20 chapters)
1
Section 1: Linux Basics
4
Section 2: Linux as a Network Node and Troubleshooting Platform
8
Section 3: Linux Network Services

Two main DNS server implementations

DNS has a large and complex infrastructure on the internet (which we'll touch on in this section). This is made up of 13 root name servers (which are each a reliable cluster of servers), a group of commonly used name servers (for instance, the servers we use at Google or Cloudflare), and a series of registrars who will, for a fee, register a DNS domain name for you—for instance, your organization's domain name.

However, for the most part, most administrators are working with the needs of their organization—working with their internal DNS name servers that face their internal folks, or with their external DNS name servers that face the internet. It is these two use cases that we'll be focusing on in this chapter. You will see as we build these examples out how the Google or Cloudflare DNS infrastructure, or even the root DNS servers, are not all that different.

An organization's "internal" DNS server...